/* ==========================================================================
   Tökni — Minimalist Tech Company Landing Page
   ========================================================================== */

/* --------------------------------------------------------------------------
   Design Tokens
   -------------------------------------------------------------------------- */

:root {
  /* Colors */
  --color-bg: #09090b;
  --color-bg-elevated: #18181b;
  --color-bg-muted: #0f0f12;
  --color-text: #fafafa;
  --color-text-muted: #a1a1aa;
  --color-text-subtle: #71717a;
  --color-border: #27272a;
  --color-accent: #3b82f6;
  
  /* Typography */
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", Consolas, monospace;
  
  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-24: 6rem;
  
  /* Layout */
  --max-width: 1000px;
  --radius: 8px;
  --radius-lg: 12px;
  
  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --duration: 200ms;
}

/* --------------------------------------------------------------------------
   Reset & Base
   -------------------------------------------------------------------------- */

*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  display: block;
  max-width: 100%;
}

address {
  font-style: normal;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

::selection {
  background: var(--color-accent);
  color: white;
}

/* --------------------------------------------------------------------------
   Header
   -------------------------------------------------------------------------- */

.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(9, 9, 11, 0.8);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.header__nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-4) var(--space-6);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  transition: opacity var(--duration) var(--ease);
}

.header__logo:hover {
  opacity: 0.7;
}

.header__logo-img {
  height: 24px;
  width: auto;
  filter: invert(1);
}

.header__logo-text {
  font-size: 1.125rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.header__links {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.header__lang {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-subtle);
  padding: var(--space-1) var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all var(--duration) var(--ease);
}

.header__lang:hover {
  color: var(--color-text);
  border-color: var(--color-text-subtle);
}

.header__link {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  transition: color var(--duration) var(--ease);
}

.header__link:hover {
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Hero
   -------------------------------------------------------------------------- */

.hero {
  padding: var(--space-24) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.hero__content {
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero__title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.03em;
  max-width: 800px;
}

.hero__title--muted {
  color: var(--color-text-muted);
}

.hero__description {
  margin-top: var(--space-6);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-text-muted);
  max-width: 600px;
}

.hero__actions {
  margin-top: var(--space-8);
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
}

/* --------------------------------------------------------------------------
   Buttons
   -------------------------------------------------------------------------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-size: 0.875rem;
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--duration) var(--ease);
  cursor: pointer;
}

.button--primary {
  background: var(--color-text);
  color: var(--color-bg);
}

.button--primary:hover {
  background: var(--color-text-muted);
  transform: translateY(-1px);
}

.button--ghost {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.button--ghost:hover {
  background: var(--color-bg-elevated);
  border-color: var(--color-text-subtle);
  color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Sections
   -------------------------------------------------------------------------- */

.section {
  padding: var(--space-24) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.section--muted {
  background: var(--color-bg-muted);
}

.section__inner {
  max-width: var(--max-width);
  margin: 0 auto;
}

.section__label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-8);
}

/* --------------------------------------------------------------------------
   Projects
   -------------------------------------------------------------------------- */

.projects {
  display: grid;
  gap: var(--space-1);
}

.project {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-rows: auto auto;
  gap: var(--space-1) var(--space-4);
  padding: var(--space-6);
  background: var(--color-bg-elevated);
  border-radius: var(--radius-lg);
  border: 1px solid transparent;
  transition: all var(--duration) var(--ease);
}

.project:hover {
  border-color: var(--color-border);
  transform: translateY(-2px);
}

.project__title {
  font-size: 1rem;
  font-weight: 500;
  grid-column: 1;
  grid-row: 1;
}

.project__description {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  grid-column: 1;
  grid-row: 2;
}

.project__arrow {
  grid-column: 2;
  grid-row: 1 / -1;
  align-self: center;
  font-size: 1.25rem;
  color: var(--color-text-subtle);
  transition: transform var(--duration) var(--ease);
}

.project:hover .project__arrow {
  transform: translateX(4px);
  color: var(--color-text);
}

@media (min-width: 640px) {
  .projects {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
  
  .project:last-child {
    grid-column: span 2;
  }
}

/* --------------------------------------------------------------------------
   About
   -------------------------------------------------------------------------- */

.about {
  display: grid;
  gap: var(--space-8);
}

@media (min-width: 640px) {
  .about {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about__heading {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-text-subtle);
  margin-bottom: var(--space-2);
}

.about__item {
  font-size: 0.9375rem;
  color: var(--color-text-muted);
}

.about__item a {
  color: var(--color-text);
  text-decoration: underline;
  text-decoration-color: var(--color-border);
  text-underline-offset: 3px;
  transition: text-decoration-color var(--duration) var(--ease);
}

.about__item a:hover {
  text-decoration-color: var(--color-text);
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */

.footer {
  padding: var(--space-6);
  background: var(--color-bg);
}

.footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  font-size: 0.8125rem;
  color: var(--color-text-subtle);
}

@media (min-width: 640px) {
  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
  }
}

.footer a {
  transition: color var(--duration) var(--ease);
}

.footer a:hover {
  color: var(--color-text-muted);
}